I did some research and he use to race in the Nationwide (then Busch series) over a 14 year span and had 9 truck starts over 3 years with one cup start in 1994 and has spotted for A.J. Allmendinger, Scott Speed and is currently spotting for Marcos Ambrose and has been since 2012

Billy is spotting for Ty Dillon in Nationwide Series, he had spotted for him in the truck series last year, he'll stick with Ty even when he moves to Cup. I don't think BIlly has any intention of leaving RCR.